We have purchased a BillyOh Expert Tongue and Groove apex workshop described as "This all-out storage, workshop, and recreational room is the next-to-home dream of every British family." If only this was true! As per the other, honest, reviews, the end product is an excellent example of poor quality workmanship. Tongue and groove cladding is a devious appeal to those looking for a quality shed who are only going to be extremely disappointed. The parts seem to be kept in a damp environment and arrive with so much warp you could travel to a distant planet! The panels are so poorly constructed that you do not even know if it is the joist or the cladding that you should square off. Either way the walls and flooring have as many gaps as our 7 year olds teeth. The integrity (both structural and to withstand weather) of floor, walls and roof rely on quality pre-constructed panels. What was sent to us should not have passed any form of quality check. The difficulty with a product like this is that you invest a lot of time and effort in getting to the stage where you realise that you have made a big mistake. However, by this point you have reached a point of no return, including the well made (solid) base that you have constructed that meets the perfect dimensions of the shed! We are currently investing in exterior builders caulk to fill the gaps between each panel before apply their stripping. We are reinforcing the frame with 4x2's. We will need to lay a solid plywood floor over the supplied floor. We will replace the windows with thicker perspex. Over time, we may even build a good quality shed, perhaps the doors will be original.